Light and Electromagnetism

Two parallel wires carrying current in the same direction will

• a.not interact.
• b.attract each other.
• c.repel each other.
• d.emit visible light.

Two parallel wires carrying current in the opposite direction will

• a.not interact.
• b.attract each other.
• c.repel each other.
• d.emit visible light.

"Induction" is a term to describe

• a.the creation of a magnetic field from a changing electric field.
• b.the creation of an electric field from a changing magnetic field.
• c.the force between two current-carrying wires.
• d.the emission of radio waves from the sun.

The speed of light is closest to

• a.3,000,000 m/s.
• b.30,000,000 m/s.
• c.300,000,000 m/s.
• d.3,000,000,000 m/s.

The shortest wavelength portion of the electromagnetic spectrum is known as

• a.ultraviolet.
• b.radio waves.
• c.infrared.
• d.gamma rays.

The longest wavelength portion of the electromagnetic spectrum is known as

• a.ultraviolet.
• b.radio waves.
• c.infrared.
• d.gamma rays.

The region of the electromagnetic spectrum where humans can detect electromagnetic radiation is

• a.visible.
• b.infrared.
• c.ultraviolet.
• d.x-ray.

The theory of electromagnetism was first devised by

• a.Michael Faraday.
• b.James Clerk Maxwell.
• c.Thomas Young.
• d.Hans Christian Oersted.

The region of the electromagnetic spectrum where the sun radiates the majority of its energy is

• a.microwave.
• b.ultraviolet.
• c.infrared.
• d.visible.

One piece of evidence that convinced Maxwell that light was electromagnetic radiation was

• a.light can generate electrical currents.
• b.a moving magnetic field can generate light.
• c.the speed of light is the same as the speed of sound.
• d.the measured speed of light was close to Maxwell's calculated speed.